The fact that you say spit or poof, and sounds like it wants to hit at times, leads me more into thinking it might be a timing issue. I really would lean toward at least doing a compression check. You have fuel, and you have spark, the only other factors is air and timing. The only other possibility, and this falls under AIR, is having a plugged exhaust due to a degraded cat converter. The problem may be, at this point, that it has been cranked over enough that the fuel will actually wash the oil off of the cylinder walls, resulting in low or no compression. A restricted exhaust can also give you low compression readings, becasue only so much air can be drawn in. You can try first to remove an oxygen sensor, and see if it will start with the extra ability to exhaust. I have no way in determining what condition we are in at this stage, But you need to go back to basics, and make sure you are dealing with a healthy motor. Here is the order I would address it in.
First I would remove the plugs, check to make sure they are not fuel fouled from liquid(wet). I would run the #1 cylinder to TDC and check the rotor position. I don't know for sure if the balancer has a TDC mark, otherwise you will have to do it the hard way. Start by bumping the engine over(w/plugs out and coil disabled) untill you feel pressure out of #1 hole. Then you would have to insert a rod or screwdriver in and touch the piston while rotating the engine by hand, until it reaches the top of it's travel. It is critical that it is at the top. Then check to make sure your rotor is pointing at #1 on the cap.
Next, with the plugs out and spark disabled, I would do a compression test on all eight. If you have low compression on one or more, add a squirt or two of oil into the easiest cylinder with an oil can, this is called a wet test. If your compression restores significantly, you have rinsed cylinder walls, and a wet test on all would be suggested. At least the better part of the eight, and it would correct itself when it runs.
At this point you may have come to a conclusion. If not, and the plugs are dry, reinstall them and connect the ignition. Remove an oxygen sensor, and crank it to see if it fires. If so, you may have a plugged exhaust.
Saturday, February 20th, 2010 AT 12:10 AM